That helps but not quite following this. The Archive directory is on the SD card? How do you move them from the archive folder to the top directory? Do you have to use your laptop?

Yes!

Your laptop, a friends laptop, a host machine where you are staying, or a DROID (phone or tablet) - iOS need not apply.

I do this because, when I travel, I will pre-load maps and GPX files etc for each area I will be visiting, and set the unit up for those areas as I arrive at them. The GPSr can only index so many map tiles and GPX files, and I almost always have more loaded on my uSD card than amy Montana can index - but I only have what I need at the time in the proper directories, and the remainder resides in my \Archive\ folder until needed.